Phthalocyanine sheet polymer based amperometric sensor for the selective detection of 2,4-dichlorophenol

Cobalt phthalocyanine sheet polymer (poly-CoPc) was synthesized by the thermal condensation of cobalt tetracarboxylicacid phthalocyanine (CoTCAPc). The synthesized complex and polymer were characterized by 1H NMR, FT-IR, absorption spectroscopy, P-XRD and thermogravimetric analysis. The formation of...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2020-08, Vol.871, p.114292, Article 114292
Main Authors: Mohammed, Imadadulla, Nemakal, Manjunatha, Aralekallu, Shambhulinga, Sajjan, Veeresh A., Divakara, T.R., Palanna, Manjunatha, Keshavananda Prabu, C.P, Sannegowda, Lokesh Koodlur
Format: Article
Language:English
Subjects:
2,4-dichlorophenol
Amperometry
Cobalt phthalocyanine sheet polymer
Cyclic voltammetry
Electrical measurement
Electrochemical analysis
Electrodes
Fourier transforms
FT-IR spectra
Glassy carbon
Infrared spectroscopy
NMR
Nuclear magnetic resonance
Oxidation
Polymers
Reproducibility
Selectivity
Sensitivity
Sensors
Spectrum analysis
Thermal stability
Thermogravimetric analysis
Voltammetry
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Summary:Cobalt phthalocyanine sheet polymer (poly-CoPc) was synthesized by the thermal condensation of cobalt tetracarboxylicacid phthalocyanine (CoTCAPc). The synthesized complex and polymer were characterized by 1H NMR, FT-IR, absorption spectroscopy, P-XRD and thermogravimetric analysis. The formation of the polymer was monitored by FT-IR spectra and the peak corresponding to –C=O and –OH of –COOH of CoTCAPc disappeared in poly-CoPc. The polymer showed highly amorphous nature with thermal stability upto 420 °C. The cyclic voltammogram of poly-CoPc exhibited redox-active behavior and the glassy carbon (GC) electrode was modified by immobilizing poly-CoPc (GC/poly-CoPc). The modified electrode was characterized by cyclic voltammetry and impedance spectroscopy and used for the electrochemical detection of 2, 4-dichlorophenol (DCP) using voltammetry and amperometric techniques. The electrocatalytic oxidation of DCP using voltammetric technique showed a linear response in the concentration range 1 to 36 μM with the limit of detection (LOD) 0.350 μM (±0.010 μM) and the sensitivity value of 0.08 μA μM−1. Further, the designed GC/poly-CoPc sensor was used to detect DCP by an amperometric technique which exhibited a linear response in the concentration range 0.5–10 μM with LOD 0.150 μM (±0.005 μM) and sensitivity value 0.0384 μA μM−1. Fabricated sensor displayed greater stability, repeatability, reproducibility and high selectivity towards the detection of DCP. Further, the designed sensor is highly selective towards the detection of DCP even in presence of various aliphatic and aromatic alochols. [Display omitted] •The poly-CoPc was synthesized by the thermal condensation of CoTCAPc in pure state and characterized with various techniques.•The synthesized polymer was casted on the glassy carbon and used for the detection of 2,4-dichlorophenol.•The modified electrode showed the remarkable electro-activity and decent linearity towards the 2,4-dichlorophenol.•The polymeric catalyst exhibited high sensitivity, stability and selectivity even in presence of interferents.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2020.114292